Magnesium Oxide Polymerization Catalyst from Japan
High-purity MgO powder serving as catalyst in polypropylene production. Classified in 3815.90.3000 for its wholly inorganic composition and role as reaction initiator.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Surface area specifications (>100m²/g) distinguish catalytic grade from refractory grade
• Include polymerization reaction data demonstrating accelerator function
• Antidumping duties may apply from certain origins; verify scope rulings